I was hoping you could help me to understand my heart problem. I was seeing a cardiologist, who was absolutely unable to figure out what my heart problem was. Every day, my heart rate accelerates to over 200 BPM (on average, about 3 times a day or more) in cycles of about 10 minutes or longer. When the cycle is occurring, I feel light headed, dizzy, sometimes I need to lay down, and it feels as if someone is grabbing my throat. Fairly often during these cycles, I am able to feel one large pulse - then I can not feel my heart beat at all - and then it accelerates into the 200s BPM. Do you have any idea what may be wrong with me?